Exxon Mobil Corp (XOM) - Get Report launched a legal challenge to the Treasury Department's Office of Foreign Assets Control ruling that the company violated U.S. sanctions against Russia in 2014, The Fly reported.

OFAC fined Exxon $2 million Thursday for the actions it took between May 14 and May 23, 2014. During that time, current Secretary of State Rex Tillerson was still Exxon's CEO.

Exxon claims it followed authoritative Obama-era guidance in its dealings with Russia, but OFAC retroactively changed the guidelines one year later. The energy company said market participants didn't have notice of the new interpretation, constituting a violation of the Administrative Procedure Act.

Exxon's filing in U.S. court said the OFAC action is "fundamentally unfair and constitutes a denial of due process under the Constitution."

Exxon stock traded slightly up late in the afternoon.

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